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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Panicum magnispicula

HABIT Perennial; caespitose. Culms 20–30 cm long. Culm-internodes terete; distally glabrous. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; striately veined; hirsute; with tubercle-based hairs; outer margin hairy. Ligule a ciliate membrane; 0.5 mm long. Leaf-blades involute; 10–12 cm long; 2 mm wide. Leaf-blade surface hirsute; with tubercle-based hairs. Leaf-blade margins ciliate. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; comprising 7–12 fertile spikelets. Peduncle 25 cm long; glabrous.

Panicle open; ovate; 3–6 cm long; 1 cm wide; bearing few spikelets. Primary panicle branches 3–4 in number; ascending; 1–3 cm long. Panicle branches scabrous; pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; scabrous; ciliate; hairy at tip.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 5.5–5.8 mm long; 1.5–2 mm wide; falling entire. Rhachilla internodes elongated between glumes. Rhachilla elongation 0.5 mm long.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 3.5 mm long; 0.75 length of spikelet; membranous; without keels; 7–9 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; membranous; without keels; 9 -veined. Upper glume inner surface pubescent. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; mid-green and purple; 9 -veined; acuminate. Palea of lower sterile floret 2.5–2.8 mm long. Fertile lemma elliptic; dorsally compressed; 3.4–3.6 mm long; 1.5–1.7 mm wide; indurate; yellow; shiny; without keel; 7 -veined. Lemma surface papillose. Lemma margins involute. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 2.2 mm long. Embryo 0.5 length of caryopsis. Hilum elliptic.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga 1996.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.